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Official crime statistics show an increase in sexual assaults across all modes of public transport.

This man was seen on the Werribee line train touching himself inappropriately in front of a child and a teenager. (9NEWS)

In the year to June 2015, sexual assaults on buses and bus stops increased by 33 percent, on trams and tram stops by 37 percent, while sex assaults on trains increased by 12 percent and at train stations by 49 percent.

"They're disgusting. It's the sort of thing that a lot of people never get over and never forget," Snr Const. Gandolfo said.

Police said the culprits are taking advantage of crowded public transport, particularly during peak hour periods.

The absence of Protective Services Officers (PSO) on board trains and trams makes it easier for them to offend unnoticed.

This man pinned a woman against a carriage wall before indecently assaulting her. (9NEWS)

Public Transport Users Association spokesman Tony Morton said the PTUA would like to see PSOs on trains and trams after dark, not just to combat sexual assaults, but also assaults.

Police encourage victims and witnesses to take photos on smartphones, while Metro Trains advises passengers to use the emergency button.

Snr Const. Gandolfo also suggests that if you feel like you're being targeted, move away and draw attention to yourself.

If you recognise any of the men in the video, contact Crime Stoppers on 1800 333 000.